Roman Returns in the Middle of 'Chicago Fire's Call in 'P.D.' Crossover (PHOTOS)

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Chicago Fire PD Crossover Roman Returns
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Chicago Fire PD Crossover Mouch
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“Off the Grid,” Chicago Fire

Mouch (Christian Stolte)

Chicago Fire PD Crossover Kidd
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Downtime for Kidd (Miranda Rae Mayo) at the firehouse

Chicago Fire PD Crossover Mouch Cruz Kid
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Mouch, Cruz (Joe Minoso), and Kidd are ready to leap into action.

Chicago Fire PD Crossover Ritter
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Ritter (Daniel Kyri) is waiting for a signal.

Chicago Fire PD Crossover Severide Call
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Gotta love this shot of Severide (Taylor Kinney) with the dedication to Shay on the ambulance door behind him.

Chicago Fire PD Crossover Casey Severide
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Casey (Jesse Spencer) and Severide are in for a surprise at a call.

Chicago Fire PD Crossover Roman
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Fancy meeting you here, Roman (Brian Geraghty)!

Chicago Fire PD Crossover Boden Intelligence Call
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Intelligence arrives to check out a Fire call.

Chicago Fire PD Crossover Intelligence 51
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Intelligence visits 51.

Chicago Fire PD Crossover Burgess
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Burgess (Marina Squerciati)

Chicago Fire PD Crossover Atwater Severide Ruzek
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Severide stops by Intelligence to work with Atwater (LaRoyce Hawkins) and Ruzek (Patrick John Flueger).

Chicago Fire PD Crossover Ruzek Severide
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Stop by the precinct any time, Severide.

Chicago Fire PD Crossover Ruzek Crime Board
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According to the board behind Ruzek, there’s at least one person dead.

Chicago Fire PD Crossover Severide Atwater Ruzek
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Severide works with Intelligence.

Chicago Fire PD Crossover Severide Intelligence
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What has Intelligence uncovered?

Chicago Fire PD Crossover Atwater Burgess
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“Burden of Truth,” Chicago P.D.

Atwater and Burgess

Chicago Fire PD Crossover Intelligence
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Intelligence in the field

Chicago Fire PD Crossover Burgess Hailey
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Burgess and Hailey (Tracy Spiridakos)

Chicago Fire PD Crossover Jay Hailey
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Jay (Jesse Lee Soffer) and Hailey lead the unit into a house.

Chicago Fire PD Crossover Burgess Roman Reunited
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Former partners, reunited

Chicago Fire PD Crossover Burgess Roman Conversation
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Will Burgess and Roman confide in each other?

Chicago Fire PD Crossover Burgess Partner
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Burgess is worried.

Chicago Fire PD Crossover Roman Investigation
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Roman’s looking rough.

Chicago Fire PD Crossover Burgess
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Burgess

Roman Chicago Fire PD Crossover
Matt Dinerstein/NBC

Roman cleaned up.

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Welcome back to the One Chicago universe, Brian Geraghty.

The actor reprises his role as Sean Roman — but he's no longer a cop — in an upcoming Chicago Fire/P.D. crossover on Wednesday, February 26. And this case is going to be quite personal for him because he's looking for his sister.

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The star also previews Roman's return to the One Chicago universe in a February 'P.D.' crossover.

"We go into a big fire just to do our job, and all of a sudden, Roman runs out and that brings us all together and we try to help him," Fire's Joe Minoso teased.

Click through the gallery above for a look at Roman's surprise appearance during a Fire call, his reunion with Burgess (Marina Squerciati) over on P.D., and more.

Chicago Fire-P.D. Crossover, Wednesday, February 26, 9/8c, NBC